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Systemd/src/network/networkd-link.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <netinet/ether.h>
#include <linux/if.h>
#include <unistd.h>
#include "networkd-link.h"
#include "networkd-netdev.h"
#include "libudev-private.h"
#include "udev-util.h"
#include "util.h"
#include "virt.h"
#include "bus-util.h"
#include "network-internal.h"
#include "conf-parser.h"
#include "dhcp-lease-internal.h"
#define FLAG_STRING(string, flag, old, new) \
(((old ^ new) & flag) \
? ((old & flag) ? (" -" string) : (" +" string)) \
: "")
static int link_update_flags(Link *link, sd_rtnl_message *m) {
unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
uint8_t operstate;
int r;
assert(link);
r = sd_rtnl_message_link_get_flags(m, &flags);
if (r < 0) {
log_warning_link(link, "Could not get link flags");
return r;
}
r = sd_rtnl_message_read_u8(m, IFLA_OPERSTATE, &operstate);
if (r < 0)
/* if we got a message without operstate, take it to mean
the state was unchanged */
operstate = link->kernel_operstate;
if ((link->flags == flags) && (link->kernel_operstate == operstate))
return 0;
if (link->flags != flags) {
log_debug_link(link, "flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
FLAG_STRING("UP", IFF_UP, link->flags, flags),
FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
/* link flags are currently at most 18 bits, let's align to
* printing 20 */
if (unknown_flags_added)
log_debug_link(link,
"unknown link flags gained: %#.5x (ignoring)",
unknown_flags_added);
if (unknown_flags_removed)
log_debug_link(link,
"unknown link flags lost: %#.5x (ignoring)",
unknown_flags_removed);
}
link->flags = flags;
link->kernel_operstate = operstate;
link_save(link);
return 0;
}
static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) {
_cleanup_link_unref_ Link *link = NULL;
uint16_t type;
const char *ifname;
int r, ifindex;
assert(manager);
assert(message);
assert(ret);
r = sd_rtnl_message_get_type(message, &type);
if (r < 0)
return r;
else if (type != RTM_NEWLINK)
return -EINVAL;
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0)
return r;
else if (ifindex <= 0)
return -EINVAL;
r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &ifname);
if (r < 0)
return r;
link = new0(Link, 1);
if (!link)
return -ENOMEM;
link->n_ref = 1;
link->manager = manager;
link->state = LINK_STATE_PENDING;
link->ifindex = ifindex;
link->ifname = strdup(ifname);
if (!link->ifname)
return -ENOMEM;
r = sd_rtnl_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
if (r < 0)
log_debug_link(link, "MAC address not found for new device, continuing without");
r = asprintf(&link->state_file, "/run/systemd/netif/links/%d",
link->ifindex);
if (r < 0)
return -ENOMEM;
r = asprintf(&link->lease_file, "/run/systemd/netif/leases/%d",
link->ifindex);
if (r < 0)
return -ENOMEM;
r = hashmap_ensure_allocated(&manager->links, NULL, NULL);
if (r < 0)
return r;
r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
if (r < 0)
return r;
r = link_update_flags(link, message);
if (r < 0)
return r;
*ret = link;
link = NULL;
return 0;
}
static void link_free(Link *link) {
Address *address;
if (!link)
return;
while ((address = link->addresses)) {
LIST_REMOVE(addresses, link->addresses, address);
address_free(address);
}
while ((address = link->pool_addresses)) {
LIST_REMOVE(addresses, link->pool_addresses, address);
address_free(address);
}
sd_dhcp_client_unref(link->dhcp_client);
sd_dhcp_lease_unref(link->dhcp_lease);
unlink(link->lease_file);
free(link->lease_file);
sd_ipv4ll_unref(link->ipv4ll);
sd_dhcp6_client_unref(link->dhcp6_client);
sd_icmp6_nd_unref(link->icmp6_router_discovery);
if (link->manager)
hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex));
free(link->ifname);
unlink(link->state_file);
free(link->state_file);
udev_device_unref(link->udev_device);
free(link);
}
Link *link_unref(Link *link) {
if (link && (-- link->n_ref <= 0))
link_free(link);
return NULL;
}
Link *link_ref(Link *link) {
if (link)
assert_se(++ link->n_ref >= 2);
return link;
}
int link_get(Manager *m, int ifindex, Link **ret) {
Link *link;
assert(m);
assert(ifindex);
assert(ret);
link = hashmap_get(m->links, INT_TO_PTR(ifindex));
if (!link)
return -ENODEV;
*ret = link;
return 0;
}
void link_drop(Link *link) {
if (!link || link->state == LINK_STATE_LINGER)
return;
link->state = LINK_STATE_LINGER;
log_debug_link(link, "link removed");
link_unref(link);
return;
}
static void link_enter_unmanaged(Link *link) {
assert(link);
log_debug_link(link, "unmanaged");
link->state = LINK_STATE_UNMANAGED;
link_save(link);
}
static int link_stop_clients(Link *link) {
int r = 0, k;
assert(link);
assert(link->manager);
assert(link->manager->event);
if (!link->network)
return 0;
if (link->dhcp_client) {
k = sd_dhcp_client_stop(link->dhcp_client);
if (k < 0) {
log_warning_link(link, "Could not stop DHCPv4 client: %s",
strerror(-r));
r = k;
}
}
if (link->ipv4ll) {
k = sd_ipv4ll_stop(link->ipv4ll);
if (k < 0) {
log_warning_link(link, "Could not stop IPv4 link-local: %s",
strerror(-r));
r = k;
}
}
if (link->dhcp_server) {
k = sd_dhcp_server_stop(link->dhcp_server);
if (k < 0) {
log_warning_link(link, "Could not stop DHCPv4 server: %s",
strerror(-r));
r = k;
}
}
if(link->icmp6_router_discovery) {
if (link->dhcp6_client) {
k = sd_dhcp6_client_stop(link->dhcp6_client);
if (k < 0) {
log_warning_link(link, "Could not stop DHCPv6 client: %s",
strerror(-r));
r = k;
}
}
k = sd_icmp6_nd_stop(link->icmp6_router_discovery);
if (k < 0) {
log_warning_link(link,
"Could not stop ICMPv6 router discovery: %s",
strerror(-r));
r = k;
}
}
return r;
}
void link_enter_failed(Link *link) {
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
log_warning_link(link, "failed");
link->state = LINK_STATE_FAILED;
link_stop_clients(link);
link_save(link);
}
static Address* link_find_dhcp_server_address(Link *link) {
Address *address;
assert(link);
assert(link->network);
/* The the first statically configured address if there is any */
LIST_FOREACH(addresses, address, link->network->static_addresses) {
if (address->family != AF_INET)
continue;
if (in_addr_is_null(address->family, &address->in_addr))
continue;
return address;
}
/* If that didn't work, find a suitable address we got from the pool */
LIST_FOREACH(addresses, address, link->pool_addresses) {
if (address->family != AF_INET)
continue;
return address;
}
return NULL;
}
static int link_enter_configured(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ROUTES);
if (link->network->dhcp_server &&
!sd_dhcp_server_is_running(link->dhcp_server)) {
struct in_addr pool_start;
Address *address;
address = link_find_dhcp_server_address(link);
if (!address) {
log_warning_link(link,
"Failed to find suitable address for DHCPv4 server instance.");
link_enter_failed(link);
return 0;
}
log_debug_link(link, "offering DHCPv4 leases");
r = sd_dhcp_server_set_address(link->dhcp_server,
&address->in_addr.in,
address->prefixlen);
if (r < 0)
return r;
/* offer 32 addresses starting from the address following the server address */
pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1);
r = sd_dhcp_server_set_lease_pool(link->dhcp_server,
&pool_start, 32);
if (r < 0)
return r;
/* TODO:
r = sd_dhcp_server_set_router(link->dhcp_server,
&main_address->in_addr.in);
if (r < 0)
return r;
r = sd_dhcp_server_set_prefixlen(link->dhcp_server,
main_address->prefixlen);
if (r < 0)
return r;
*/
r = sd_dhcp_server_start(link->dhcp_server);
if (r < 0) {
log_warning_link(link, "could not start DHCPv4 server "
"instance: %s", strerror(-r));
link_enter_failed(link);
return 0;
}
}
log_info_link(link, "link configured");
link->state = LINK_STATE_CONFIGURED;
link_save(link);
return 0;
}
void link_client_handler(Link *link) {
assert(link);
assert(link->network);
if (!link->static_configured)
return;
if (link->network->ipv4ll)
if (!link->ipv4ll_address ||
!link->ipv4ll_route)
return;
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4))
if (!link->dhcp4_configured)
return;
if (link->state != LINK_STATE_CONFIGURED)
link_enter_configured(link);
return;
}
static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link->link_messages > 0);
assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED,
LINK_STATE_LINGER));
link->link_messages --;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not set route: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
if (link->link_messages == 0) {
log_debug_link(link, "routes set");
link->static_configured = true;
link_client_handler(link);
}
return 1;
}
static int link_enter_set_routes(Link *link) {
Route *rt;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_SETTING_ADDRESSES);
link->state = LINK_STATE_SETTING_ROUTES;
LIST_FOREACH(routes, rt, link->network->static_routes) {
r = route_configure(rt, link, &route_handler);
if (r < 0) {
log_warning_link(link,
"could not set routes: %s",
strerror(-r));
link_enter_failed(link);
return r;
}
link->link_messages ++;
}
if (link->link_messages == 0) {
link->static_configured = true;
link_client_handler(link);
} else
log_debug_link(link, "setting routes");
return 0;
}
int link_route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -ESRCH)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not drop route: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 1;
}
int link_get_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(rtnl);
assert(m);
assert(link);
assert(link->manager);
for (; m; m = sd_rtnl_message_next(m)) {
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
log_debug_link(link, "getting address failed: %s",
strerror(-r));
continue;
}
r = link_rtnl_process_address(rtnl, m, link->manager);
if (r < 0)
log_warning_link(link, "could not process address: %s",
strerror(-r));
}
return 1;
}
static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(rtnl);
assert(m);
assert(link);
assert(link->ifname);
assert(link->link_messages > 0);
assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES,
LINK_STATE_FAILED, LINK_STATE_LINGER));
link->link_messages --;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not set address: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
else if (r >= 0) {
/* calling handler directly so take a ref */
link_ref(link);
link_get_address_handler(rtnl, m, link);
}
if (link->link_messages == 0) {
log_debug_link(link, "addresses set");
link_enter_set_routes(link);
}
return 1;
}
static int link_enter_set_addresses(Link *link) {
Address *ad;
int r;
assert(link);
assert(link->network);
assert(link->state != _LINK_STATE_INVALID);
link->state = LINK_STATE_SETTING_ADDRESSES;
LIST_FOREACH(addresses, ad, link->network->static_addresses) {
r = address_configure(ad, link, &address_handler);
if (r < 0) {
log_warning_link(link,
"could not set addresses: %s",
strerror(-r));
link_enter_failed(link);
return r;
}
link->link_messages ++;
}
if (link->link_messages == 0) {
link_enter_set_routes(link);
} else
log_debug_link(link, "setting addresses");
return 0;
}
int link_address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EADDRNOTAVAIL)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not drop address: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 1;
}
static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata,
sd_bus_error *ret_error) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_bus_message_get_errno(m);
if (r < 0)
r = -r;
if (r > 0)
log_warning_link(link, "Could not set hostname: %s",
strerror(r));
return 1;
}
int link_set_hostname(Link *link, const char *hostname) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r = 0;
assert(link);
assert(link->manager);
assert(hostname);
log_debug_link(link, "Setting transient hostname: '%s'", hostname);
if (!link->manager->bus) {
/* TODO: replace by assert when we can rely on kdbus */
log_info_link(link,
"Not connected to system bus, ignoring transient hostname.");
return 0;
}
r = sd_bus_message_new_method_call(
link->manager->bus,
&m,
"org.freedesktop.hostname1",
"/org/freedesktop/hostname1",
"org.freedesktop.hostname1",
"SetHostname");
if (r < 0)
return r;
r = sd_bus_message_append(m, "sb", hostname, false);
if (r < 0)
return r;
r = sd_bus_call_async(link->manager->bus, NULL, m, set_hostname_handler,
link, 0);
if (r < 0) {
log_error_link(link, "Could not set transient hostname: %s",
strerror(-r));
return r;
}
link_ref(link);
return 0;
}
static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(m);
assert(link);
assert(link->ifname);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0)
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not set MTU: %s",
IFNAMSIZ, link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
return 1;
}
int link_set_mtu(Link *link, uint32_t mtu) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "setting MTU: %" PRIu32, mtu);
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_SETLINK message");
return r;
}
r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu);
if (r < 0) {
log_error_link(link, "Could not append MTU: %s", strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link,
0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s",
strerror(-r));
return r;
}
link_ref(link);
return 0;
}
static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
Link *link = userdata;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case DHCP6_EVENT_STOP:
case DHCP6_EVENT_RESEND_EXPIRE:
case DHCP6_EVENT_RETRANS_MAX:
case DHCP6_EVENT_IP_ACQUIRE:
log_debug_link(link, "DHCPv6 event %d", event);
break;
default:
if (event < 0)
log_warning_link(link, "DHCPv6 error: %s",
strerror(-event));
else
log_warning_link(link, "DHCPv6 unknown event: %d",
event);
return;
}
}
static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) {
Link *link = userdata;
int r;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE:
case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER:
return;
case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT:
case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED:
break;
default:
if (event < 0)
log_warning_link(link, "ICMPv6 error: %s",
strerror(-event));
else
log_warning_link(link, "ICMPv6 unknown event: %d",
event);
return;
}
if (link->dhcp6_client)
return;
r = sd_dhcp6_client_new(&link->dhcp6_client);
if (r < 0)
return;
r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_set_mac(link->dhcp6_client, &link->mac);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler,
link);
if (r < 0) {
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return;
}
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
}
static int link_acquire_conf(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->manager);
assert(link->manager->event);
if (link->network->ipv4ll) {
assert(link->ipv4ll);
log_debug_link(link, "acquiring IPv4 link-local address");
r = sd_ipv4ll_start(link->ipv4ll);
if (r < 0) {
log_warning_link(link, "could not acquire IPv4 "
"link-local address");
return r;
}
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) {
assert(link->dhcp_client);
log_debug_link(link, "acquiring DHCPv4 lease");
r = sd_dhcp_client_start(link->dhcp_client);
if (r < 0) {
log_warning_link(link, "could not acquire DHCPv4 "
"lease");
return r;
}
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) {
assert(link->icmp6_router_discovery);
log_debug_link(link, "discovering IPv6 routers");
r = sd_icmp6_router_solicitation_start(link->icmp6_router_discovery);
if (r < 0) {
log_warning_link(link,
"could not start IPv6 router discovery");
return r;
}
}
return 0;
}
bool link_has_carrier(Link *link) {
/* see Documentation/networking/operstates.txt in the kernel sources */
if (link->kernel_operstate == IF_OPER_UP)
return true;
if (link->kernel_operstate == IF_OPER_UNKNOWN)
/* operstate may not be implemented, so fall back to flags */
if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT))
return true;
return false;
}
static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0) {
/* we warn but don't fail the link, as it may
be brought up later */
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not bring up interface: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
}
return 1;
}
static int link_up(Link *link) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
log_debug_link(link, "bringing link up");
r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_link(link, "Could not allocate RTM_SETLINK message");
return r;
}
r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
if (r < 0) {
log_error_link(link, "Could not set link flags: %s",
strerror(-r));
return r;
}
r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link,
0, NULL);
if (r < 0) {
log_error_link(link,
"Could not send rtnetlink message: %s",
strerror(-r));
return r;
}
link_ref(link);
return 0;
}
static int link_joined(Link *link) {
int r;
assert(link);
assert(link->network);
if (!(link->flags & IFF_UP)) {
r = link_up(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return link_enter_set_addresses(link);
}
static int netdev_join_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
assert(link->network);
link->enslaving --;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_struct_link(LOG_ERR, link,
"MESSAGE=%-*s: could not join netdev: %s",
IFNAMSIZ,
link->ifname, strerror(-r),
"ERRNO=%d", -r,
NULL);
link_enter_failed(link);
return 1;
} else
log_debug_link(link, "joined netdev");
if (link->enslaving <= 0)
link_joined(link);
return 1;
}
static int link_enter_join_netdev(Link *link) {
NetDev *netdev;
Iterator i;
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_PENDING);
link->state = LINK_STATE_ENSLAVING;
link_save(link);
if (!link->network->bridge &&
!link->network->bond &&
hashmap_isempty(link->network->stacked_netdevs))
return link_joined(link);
if (link->network->bond) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, link->network->bond->ifname,
NETDEVIF(link->network->bond),
NULL);
r = netdev_join(link->network->bond, link, &netdev_join_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not join netdev '%s': %s",
IFNAMSIZ,
link->ifname, link->network->bond->ifname,
strerror(-r),
NETDEVIF(link->network->bond),
NULL);
link_enter_failed(link);
return r;
}
link->enslaving ++;
}
if (link->network->bridge) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, link->network->bridge->ifname,
NETDEVIF(link->network->bridge),
NULL);
r = netdev_join(link->network->bridge, link,
&netdev_join_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not join netdev '%s': %s",
IFNAMSIZ,
link->ifname, link->network->bridge->ifname,
strerror(-r),
NETDEVIF(link->network->bridge),
NULL);
link_enter_failed(link);
return r;
}
link->enslaving ++;
}
HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
log_struct_link(LOG_DEBUG, link,
"MESSAGE=%-*s: enslaving by '%s'",
IFNAMSIZ,
link->ifname, netdev->ifname, NETDEVIF(netdev),
NULL);
r = netdev_join(netdev, link, &netdev_join_handler);
if (r < 0) {
log_struct_link(LOG_WARNING, link,
"MESSAGE=%-*s: could not join netdev '%s': %s",
IFNAMSIZ,
link->ifname, netdev->ifname,
strerror(-r),
NETDEVIF(netdev), NULL);
link_enter_failed(link);
return r;
}
link->enslaving ++;
}
return 0;
}
static int link_configure(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->state == LINK_STATE_PENDING);
if (link->network->ipv4ll) {
r = ipv4ll_configure(link);
if (r < 0)
return r;
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) {
r = dhcp4_configure(link);
if (r < 0)
return r;
}
if (link->network->dhcp_server) {
r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
if (r < 0)
return r;
r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
if (r < 0)
return r;
}
if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) {
r = sd_icmp6_nd_new(&link->icmp6_router_discovery);
if (r < 0)
return r;
r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery,
NULL, 0);
if (r < 0)
return r;
r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery,
&link->mac);
if (r < 0)
return r;
r = sd_icmp6_nd_set_index(link->icmp6_router_discovery,
link->ifindex);
if (r < 0)
return r;
r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery,
icmp6_router_handler, link);
if (r < 0)
return r;
}
if (link_has_carrier(link)) {
r = link_acquire_conf(link);
if (r < 0)
return r;
}
return link_enter_join_netdev(link);
}
static int link_initialized_and_synced(sd_rtnl *rtnl, sd_rtnl_message *m,
void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
Network *network;
int r;
assert(link);
assert(link->ifname);
assert(link->manager);
if (link->state != LINK_STATE_PENDING)
return 1;
log_debug_link(link, "link state is up-to-date");
r = network_get(link->manager, link->udev_device, link->ifname,
&link->mac, &network);
if (r == -ENOENT) {
link_enter_unmanaged(link);
return 1;
} else if (r < 0)
return r;
if (link->flags & IFF_LOOPBACK) {
log_debug_link(link, "matching network ignored for loopback link");
link_enter_unmanaged(link);
return 1;
}
r = network_apply(link->manager, network, link);
if (r < 0)
return r;
r = link_configure(link);
if (r < 0)
return r;
return 1;
}
int link_initialized(Link *link, struct udev_device *device) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(device);
if (link->state != LINK_STATE_PENDING)
return 0;
if (link->udev_device)
return 0;
log_debug_link(link, "udev initialized link");
link->udev_device = udev_device_ref(device);
/* udev has initialized the link, but we don't know if we have yet
* processed the NEWLINK messages with the latest state. Do a GETLINK,
* when it returns we know that the pending NEWLINKs have already been
* processed and that we are up-to-date */
r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
link->ifindex);
if (r < 0)
return r;
r = sd_rtnl_call_async(link->manager->rtnl, req,
link_initialized_and_synced, link, 0, NULL);
if (r < 0)
return r;
link_ref(link);
return 0;
}
int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message,
void *userdata) {
Manager *m = userdata;
Link *link = NULL;
uint16_t type;
_cleanup_address_free_ Address *address = NULL;
Address *ad;
char buf[INET6_ADDRSTRLEN];
char valid_buf[FORMAT_TIMESPAN_MAX];
const char *valid_str = NULL;
bool address_dropped = false;
int r, ifindex;
assert(rtnl);
assert(message);
assert(m);
r = sd_rtnl_message_get_type(message, &type);
if (r < 0) {
log_warning("rtnl: could not get message type");
return 0;
}
r = sd_rtnl_message_addr_get_ifindex(message, &ifindex);
if (r < 0 || ifindex <= 0) {
log_warning("rtnl: received address message without valid ifindex, ignoring");
return 0;
} else {
r = link_get(m, ifindex, &link);
if (r < 0 || !link) {
log_warning("rtnl: received address for a nonexistent link, ignoring");
return 0;
}
}
r = address_new_dynamic(&address);
if (r < 0)
return r;
r = sd_rtnl_message_addr_get_family(message, &address->family);
if (r < 0 || !IN_SET(address->family, AF_INET, AF_INET6)) {
log_warning_link(link,
"rtnl: received address with invalid family, ignoring");
return 0;
}
r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen);
if (r < 0) {
log_warning_link(link,
"rtnl: received address with invalid prefixlen, ignoring");
return 0;
}
r = sd_rtnl_message_addr_get_scope(message, &address->scope);
if (r < 0) {
log_warning_link(link,
"rtnl: received address with invalid scope, ignoring");
return 0;
}
r = sd_rtnl_message_addr_get_flags(message, &address->flags);
if (r < 0) {
log_warning_link(link,
"rtnl: received address with invalid flags, ignoring");
return 0;
}
switch (address->family) {
case AF_INET:
r = sd_rtnl_message_read_in_addr(message, IFA_LOCAL,
&address->in_addr.in);
if (r < 0) {
log_warning_link(link,
"rtnl: received address without valid address, ignoring");
return 0;
}
break;
case AF_INET6:
r = sd_rtnl_message_read_in6_addr(message, IFA_ADDRESS,
&address->in_addr.in6);
if (r < 0) {
log_warning_link(link,
"rtnl: received address without valid address, ignoring");
return 0;
}
break;
default:
assert_not_reached("invalid address family");
}
if (!inet_ntop(address->family, &address->in_addr, buf,
INET6_ADDRSTRLEN)) {
log_warning_link(link, "could not print address");
return 0;
}
r = sd_rtnl_message_read_cache_info(message, IFA_CACHEINFO,
&address->cinfo);
if (r >= 0) {
if (address->cinfo.ifa_valid == CACHE_INFO_INFINITY_LIFE_TIME)
valid_str = "ever";
else
valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX,
address->cinfo.ifa_valid * USEC_PER_SEC,
USEC_PER_SEC);
}
LIST_FOREACH(addresses, ad, link->addresses) {
if (address_equal(ad, address)) {
LIST_REMOVE(addresses, link->addresses, ad);
address_free(ad);
address_dropped = true;
break;
}
}
switch (type) {
case RTM_NEWADDR:
if (!address_dropped)
log_debug_link(link, "added address: %s/%u (valid for %s)",
buf, address->prefixlen,
strna(valid_str));
else
log_debug_link(link, "updated address: %s/%u (valid for %s)",
buf, address->prefixlen,
strna(valid_str));
LIST_PREPEND(addresses, link->addresses, address);
address = NULL;
link_save(link);
break;
case RTM_DELADDR:
if (address_dropped) {
log_debug_link(link, "removed address: %s/%u (valid for %s)",
buf, address->prefixlen,
strna(valid_str));
link_save(link);
} else
log_warning_link(link,
"removing non-existent address: %s/%u (valid for %s)",
buf, address->prefixlen,
strna(valid_str));
break;
default:
assert_not_reached("Received invalid RTNL message type");
}
return 1;
}
int link_add(Manager *m, sd_rtnl_message *message, Link **ret) {
Link *link;
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
_cleanup_udev_device_unref_ struct udev_device *device = NULL;
char ifindex_str[2 + DECIMAL_STR_MAX(int)];
int r;
assert(m);
assert(m->rtnl);
assert(message);
assert(ret);
r = link_new(m, message, ret);
if (r < 0)
return r;
link = *ret;
log_debug_link(link, "link %d added", link->ifindex);
r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, link->ifindex,
0);
if (r < 0)
return r;
r = sd_rtnl_call_async(m->rtnl, req, link_get_address_handler, link, 0,
NULL);
if (r < 0)
return r;
link_ref(link);
if (detect_container(NULL) <= 0) {
/* not in a container, udev will be around */
sprintf(ifindex_str, "n%d", link->ifindex);
device = udev_device_new_from_device_id(m->udev, ifindex_str);
if (!device) {
log_warning_link(link,
"could not find udev device: %m");
return -errno;
}
if (udev_device_get_is_initialized(device) <= 0) {
/* not yet ready */
log_debug_link(link, "link pending udev initialization...");
return 0;
}
r = link_initialized(link, device);
if (r < 0)
return r;
} else {
/* we are calling a callback directly, so must take a ref */
link_ref(link);
r = link_initialized_and_synced(m->rtnl, NULL, link);
if (r < 0)
return r;
}
return 0;
}
int link_update(Link *link, sd_rtnl_message *m) {
struct ether_addr mac;
const char *ifname;
uint32_t mtu;
bool had_carrier, carrier_gained, carrier_lost;
int r;
assert(link);
assert(link->ifname);
assert(m);
if (link->state == LINK_STATE_LINGER) {
link_ref(link);
log_info_link(link, "link readded");
link->state = LINK_STATE_ENSLAVING;
}
r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname);
if (r >= 0 && !streq(ifname, link->ifname)) {
log_info_link(link, "renamed to %s", ifname);
free(link->ifname);
link->ifname = strdup(ifname);
if (!link->ifname)
return -ENOMEM;
}
r = sd_rtnl_message_read_u32(m, IFLA_MTU, &mtu);
if (r >= 0 && mtu > 0) {
link->mtu = mtu;
if (!link->original_mtu) {
link->original_mtu = mtu;
log_debug_link(link, "saved original MTU: %"
PRIu32, link->original_mtu);
}
if (link->dhcp_client) {
r = sd_dhcp_client_set_mtu(link->dhcp_client,
link->mtu);
if (r < 0) {
log_warning_link(link,
"Could not update MTU in DHCP client: %s",
strerror(-r));
return r;
}
}
}
/* The kernel may broadcast NEWLINK messages without the MAC address
set, simply ignore them. */
r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
if (r >= 0) {
if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
ETH_ALEN)) {
memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
ETH_ALEN);
log_debug_link(link, "MAC address: "
"%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
mac.ether_addr_octet[0],
mac.ether_addr_octet[1],
mac.ether_addr_octet[2],
mac.ether_addr_octet[3],
mac.ether_addr_octet[4],
mac.ether_addr_octet[5]);
if (link->ipv4ll) {
r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
if (r < 0) {
log_warning_link(link,
"Could not update MAC address in IPv4LL client: %s",
strerror(-r));
return r;
}
}
if (link->dhcp_client) {
r = sd_dhcp_client_set_mac(link->dhcp_client,
&link->mac);
if (r < 0) {
log_warning_link(link,
"Could not update MAC address in DHCP client: %s",
strerror(-r));
return r;
}
}
if (link->dhcp6_client) {
r = sd_dhcp6_client_set_mac(link->dhcp6_client,
&link->mac);
if (r < 0) {
log_warning_link(link,
"Could not update MAC address in DHCPv6 client: %s",
strerror(-r));
return r;
}
}
}
}
had_carrier = link_has_carrier(link);
r = link_update_flags(link, m);
if (r < 0)
return r;
carrier_gained = !had_carrier && link_has_carrier(link);
carrier_lost = had_carrier && !link_has_carrier(link);
if (carrier_gained) {
log_info_link(link, "gained carrier");
if (link->network) {
r = link_acquire_conf(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
} else if (carrier_lost) {
log_info_link(link, "lost carrier");
r = link_stop_clients(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
return 0;
}
static void link_update_operstate(Link *link) {
assert(link);
if (link->kernel_operstate == IF_OPER_DORMANT)
link->operstate = LINK_OPERSTATE_DORMANT;
else if (link_has_carrier(link)) {
Address *address;
uint8_t scope = RT_SCOPE_NOWHERE;
/* if we have carrier, check what addresses we have */
LIST_FOREACH(addresses, address, link->addresses) {
if (address->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED))
continue;
if (address->scope < scope)
scope = address->scope;
}
if (scope < RT_SCOPE_SITE)
/* universally accessible addresses found */
link->operstate = LINK_OPERSTATE_ROUTABLE;
else if (scope < RT_SCOPE_HOST)
/* only link or site local addresses found */
link->operstate = LINK_OPERSTATE_DEGRADED;
else
/* no useful addresses found */
link->operstate = LINK_OPERSTATE_CARRIER;
} else if (link->flags & IFF_UP)
link->operstate = LINK_OPERSTATE_NO_CARRIER;
else
link->operstate = LINK_OPERSTATE_OFF;
}
int link_save(Link *link) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *admin_state, *oper_state;
int r;
assert(link);
assert(link->state_file);
assert(link->lease_file);
assert(link->manager);
link_update_operstate(link);
r = manager_save(link->manager);
if (r < 0)
return r;
if (link->state == LINK_STATE_LINGER) {
unlink(link->state_file);
return 0;
}
admin_state = link_state_to_string(link->state);
assert(admin_state);
oper_state = link_operstate_to_string(link->operstate);
assert(oper_state);
r = fopen_temporary(link->state_file, &f, &temp_path);
if (r < 0)
return r;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"ADMIN_STATE=%s\n"
"OPER_STATE=%s\n",
admin_state, oper_state);
if (link->network) {
char **address, **domain;
bool space;
fputs("DNS=", f);
space = false;
STRV_FOREACH(address, link->network->dns) {
if (space)
fputc(' ', f);
fputs(*address, f);
space = true;
}
if (link->network->dhcp_dns &&
link->dhcp_lease) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
if (r > 0) {
if (space)
fputc(' ', f);
serialize_in_addrs(f, addresses, r);
}
}
fputs("\n", f);
fprintf(f, "NTP=");
space = false;
STRV_FOREACH(address, link->network->ntp) {
if (space)
fputc(' ', f);
fputs(*address, f);
space = true;
}
if (link->network->dhcp_ntp &&
link->dhcp_lease) {
const struct in_addr *addresses;
r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
if (r > 0) {
if (space)
fputc(' ', f);
serialize_in_addrs(f, addresses, r);
}
}
fputs("\n", f);
fprintf(f, "DOMAINS=");
space = false;
STRV_FOREACH(domain, link->network->domains) {
if (space)
fputc(' ', f);
fputs(*domain, f);
space = true;
}
if (link->network->dhcp_domains &&
link->dhcp_lease) {
const char *domainname;
r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
if (r >= 0) {
if (space)
fputc(' ', f);
fputs(domainname, f);
}
}
fputs("\n", f);
fprintf(f, "WILDCARD_DOMAIN=%s\n",
yes_no(link->network->wildcard_domain));
fprintf(f, "LLMNR=%s\n",
llmnr_support_to_string(link->network->llmnr));
}
if (link->dhcp_lease) {
assert(link->network);
r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
if (r < 0)
goto fail;
fprintf(f,
"DHCP_LEASE=%s\n",
link->lease_file);
} else
unlink(link->lease_file);
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, link->state_file) < 0) {
r = -errno;
goto fail;
}
return 0;
fail:
log_error_link(link, "Failed to save link data to %s: %s", link->state_file, strerror(-r));
unlink(link->state_file);
unlink(temp_path);
return r;
}
static const char* const link_state_table[_LINK_STATE_MAX] = {
[LINK_STATE_PENDING] = "pending",
[LINK_STATE_ENSLAVING] = "configuring",
[LINK_STATE_SETTING_ADDRESSES] = "configuring",
[LINK_STATE_SETTING_ROUTES] = "configuring",
[LINK_STATE_CONFIGURED] = "configured",
[LINK_STATE_UNMANAGED] = "unmanaged",
[LINK_STATE_FAILED] = "failed",
[LINK_STATE_LINGER] = "linger",
};
DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
[LINK_OPERSTATE_OFF] = "off",
[LINK_OPERSTATE_NO_CARRIER] = "no-carrier",
[LINK_OPERSTATE_DORMANT] = "dormant",
[LINK_OPERSTATE_CARRIER] = "carrier",
[LINK_OPERSTATE_DEGRADED] = "degraded",
[LINK_OPERSTATE_ROUTABLE] = "routable",
};
DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
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